package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.common.AuthServerConstant;
import com.atguigu.common.common.CartConstant;
import com.atguigu.common.vo.MemberResponseVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 执行目标方法之前，判断用户登录状态，并封装传递给controller目标请求
 */
@Component
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberResponseVo member = (MemberResponseVo)session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(member != null){
            userInfoTo.setUserId(member.getId());
        }

        Cookie[] cookies = request.getCookies();
        if(cookies != null && cookies.length >0){
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if (CartConstant.TEMP_USER_COOKIE_NAME.equals(name)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                    break;
                }
            }
        }
        //如果没有临时用户一定分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }

        //目标方法执行之前
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行之后,分配临时用户，让浏览器保存（cookie）
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        UserInfoTo userInfoTo = threadLocal.get();
        // 1、判断是否登录；2、判断是否创建user-token的cookie
        if(!userInfoTo.isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }

    }
}
